Instrument Written Missed Questions

Dry adiabatic lapse rate

3 degrees per 1000

The average height of the troposphere in the middle latitude is

37,000 feet

A jet stream is defined as wind of

50 knots or greater

What type of clouds will be formed if very stable moist air is forced upslope?

Stratified clouds with little vertical development.

If squall lines are reported at your destination, what wind conditions should you expect?

Sudden increase in wind speed of at least 16 knots, rising to 22 knots or more, lasting for at least 1 minute.

Which conditions result in the formation of frost?

Temperature of the collecting surface is below the dewpoint of surrounding air and the dew point is colder than freezing.

What is the operational consideration if you fly into rain which freezes on impact?

Temperatures are above freezing at some higher altitude.

Weather combinations that result in cumuliform-type clouds, good visibility, rain showers, and possible clear-type icing in clouds?

Unstable, moist air, and orographic lifting.

Hazardous wind shear is commonly encountered near the ground...

during periods of strong temperature inversion and near thunderstorms.

A common type of ground or surface based temperature inversion is that which is produced by?

ground radiation on a clear, cool nights when the wind is light.

A pilot reporting turbulence that momentarily causes slight, erratic changes in altitude and/or attitude should report it as

light turbulence

What should pilots do if icing is detected while also experiencing a rolling condition?

set power and angle of attack for a controlled descent.

Steady precipitation, in contrast to showers, preceding a front is an indication of

stratiform clouds with little of no turbulence.

The primary cause of all changes in Earth's weather is

variation of solar energy received by the Earth's regions.

Maximum downdrafts in a microburst encounter may be as string as?

6000 feet per minute

Which weather phenomenon is always associated with the passage of a frontal system?

A wind change

Stability can be determined from which measurement of the atmosphere?

Ambient lapse rate.

Which are characteristics of an unstable cold air mass moving over a warm surface?

Cumuliform clouds, turbulence, and good visibility.

Under which condition does advection fog usually form?

Moist air moving over colder ground or water.

What are the characteristics of stable air?

Poor visibility, steady precipitation, and stratus-type clouds.

Frontal waves normally form on

Slow moving cold fronts or stationary fronts.

What determines the structure or type of clouds which form as a result of air being forced to ascend?

The stability of the air before lifting occurs.

What enhances the growth rate of precipitation?

Upward currents.

Which is a characteristic of low-level wind shear as it relates to frontal activity?

With a warm front, the most critical period is before the front passes the airport.

A characteristic of the stratosphere is

relatively small changes in temperature with an increase in altitude.

If a pilot encounters freezing drizzle, he can assume that

there is warmer air above.